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Stall Warning - AofA
One of the design features of the Cessna 150 that I admired most is the
stall warning. It is a small aperture in the lower curve of the leading edge guarded by a wire screen (those pesky flies!) The cavity connects to a tube leading to the wing root in the cabin. There, covering the other end of the tube is a mouth organ reed, arrange to be silent when blown, and to whine when sucked. That's three components and just one moving part if you could call a vibrating reed, a moving part..... The most bang from the least buck - it seems to me. It was pre flight checkable - with a wipeoff of fly squash and a mouth applied suck. Wonderful! It was not everyone's cup of tea, I don't suppose: in particular, that mouth to wing actvity was eliminated by a small vane on a microswitch, which howled when the vane pushed up at high AofA. I think that was a C172 mod wasn't it? It needed power to work though. Anyway, for something a little fancier yet, a kind of lift reserve or AofA indicator that takes two pitot tubes to a differential pressure gage, shown he about $`125 http://www.pipcom.com/~cowcam/AOAr.htm I am prejudiced in favor of red sector in right, not in left but that's just my feeling. [No financial interest] Brian Whatcott Altus OK |
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